bug fixes

TODO.md

@@ -732,12 +732,23 @@
   - deferred: build graph / steps / caching, multiple artifacts, computed paths
     (needs string building), struct field defaults to drop `&[]` on empty lists
 
-29. basic `std/arraylist` implementation using the new `std/mem` typed allocation
+29. fix bugs (implemented)
+  - `return _` was already the supported empty return for void functions; the original
+    bare-`return` report was stale
+  - catch value blocks may end by returning from the function instead of yielding when
+    every path exits
+  - implicit-conversion diagnostics render source-level composite and named types instead
+    of internal `<type N>` ids
+  - aliases resolve transparently in value contexts, including composed enum/union sums
+  - final open-constant defaults feed one last inference fixpoint before stale
+    specializations are pruned
 
-30. disallow arbitrary integer division
+30. basic `std/arraylist` implementation using the new `std/mem` typed allocation
+
+31. disallow arbitrary integer division
   - take inspiration from zig
   - see also below for a word on unchecked casts
-  - the user should be explicit about what they mean with integer division (e.g. `div`, `rem`)
+  - the user should be explicit about what they mean with integer division (e.g. `div`, `rem`, `trunc`)
 
 ## A word on unchecked casts